Mark in vivid color on practically any surface. The opaque, water-based ink in Uni Posca markers dries to a matte finish on both porous and non-porous surfaces. Odorless, fadeproof, and bleed-proof, these markers are great for posters, signs, sketching, lettering, graphs, and charts. Use them on paper, matboard, wood, styrofoam, metal, plastic, vinyl, glass, and more.